Actually, to be honest - I don't like Kate's outfit at all. She looks swamped, she's so slight, and those shoes and that bag categorically do not go - the bag looks to be clashing with the red, imo. The styling is all a bit fusty and fussy. She's a young, pretty woman, and could wear something lovely that is just as appropriate but is less matronly.
I don't know, I know she likes Catherine Walker but it all feels so dated and mother of the bride-esque to me!